JPH11117877A - Scroll type compressor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enhance the lubrication by oil and to restrain sludge from being produced. SOLUTION: In a scroll type compressor, an auxiliary shaft part 141b is extended from an end face of a large diameter part of a main shaft, at a position eccentric from the large diameter part of the main shaft, and a disc-like bushing 127 is attached to the auxiliary shaft part 141b, eccentric from the main shaft. Further, the auxiliary shaft part 141b has a shaft cut-out 141e formed at a position which is axial and which is opposed to the bottom surface of a bore, and a counterbored part 141f formed in an end face of the bushing 127, the shaft cut-out 141e is made to communicate with the counterbored part 141f.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a scroll type compressor for compressing a fluid by moving a fluid pocket formed by a movable scroll member and a fixed scroll member while changing the volume thereof.

[0002]

2. Description of the Related Art Generally, a scroll compressor has a fixed scroll member and a movable scroll member.
Furthermore, a drive mechanism is provided for giving a turning motion to the movable scroll member in accordance with the rotation of the main shaft. The volume of the fluid pocket formed by the movable scroll member and the fixed scroll member is changed and moved in accordance with the rotation of the main shaft, thereby compressing the fluid (refrigerant).

In such a scroll type compressor,
A scroll compressor having a variable compression capacity is known.
In this variable displacement compressor, a plurality of pairs of bypass holes are formed in the bottom plate of the fixed scroll member, and by controlling the opening and closing of the bypass holes, a part of the refrigerant gas is returned from the fluid pocket to the suction chamber. The compression capacity is changed.

FIGS. 3 to 5 show the cross-sectional structure of a scroll compressor according to the prior art. This compressor is
Front end plate (front housing) 11
And a compressor housing 10 having a cup-shaped portion (rear casing) 12 disposed therein. The front end plate 11 has a through hole 101 having a center on the center line of the housing 10 at the center thereof, and supports the main shaft 14 via a bearing 13 therein. Thus, the axis of the main shaft 14 coincides with the center axis of the housing 10.

A main shaft large diameter portion 141 is formed on the inner end side of the main shaft 13.
3 rotatably supported. Main shaft large diameter part 14
1, a sub shaft portion 141b extends from an end surface 141a of the main shaft large diameter portion 141 at a position eccentric to the main shaft 14. A disk-shaped bush 127 eccentric to the main shaft 14 is attached to the sub shaft portion 141b. Counter shaft 14
1b is a shaft hole (spindle 14) formed in the bush 127.
127a (located at an eccentric position with respect to).

[0006] The sub shaft portion 141b has a large diameter portion 141 of the main shaft.
A shaft flange 141c having a larger diameter than the shaft hole 127a, which is located between the end surface 141a of the base member 141 and a rear surface facing the end surface 141a at a predetermined interval;
annular groove 141 formed on the peripheral surface of the distal end portion b
d. Snap ring 3 in groove 141d
5 are fitted. The snap ring 35 serves to prevent the counter shaft portion 141b from being pulled out of the bush 127.

Further, the notch 14 is formed in the sub shaft 141b at a position facing the bottom of the shaft hole 127a in the axial direction.
1e is formed. The shaft notch 141e supplies oil to the shaft hole 127a to form the shaft hole 127a and the sub shaft 141.
It plays a role of improving the lubricity with b.

The housing 10 has a main shaft 14 on the front end surface thereof.
Sleeve portion 15 protruding forward so as to surround the outer periphery of
, And a shaft seal 16 is disposed in the sleeve portion 15. An electromagnetic clutch device 17 is provided on the outer periphery of the sleeve portion 15. Electromagnetic clutch device 17
Is a V-belt (not shown) that rotates from an external drive source.
The transmission of the rotational motion from the pulley 71 to the main shaft 14 is controlled by controlling the energization of the exciting coil 72.

The rear end face of the front end plate 11 is formed with a cylindrical projection 42 projecting in the axial direction. The inner peripheral surface of the opening of the cup-shaped portion 12 is joined to the outer peripheral surface of the projection 42. This joint surface is sealed by the O-ring 18 provided on the outer peripheral surface of the projection 42.

The cup-shaped portion 12 is fixed to the fixed scroll member 20 by bolts 23 and the like. In FIG. 3, since the sleeve portion 15 is formed separately from the front end plate 11, the sleeve portion 15 is fixed by bolts and the like, and the joint surface is sealed by the O-ring 19.

A fixed scroll member 20, a movable scroll member 21, a movable scroll member driving mechanism and a rotation preventing mechanism 22 are provided in the cup-shaped portion 12 whose opening is closed by the front end plate 11.

The fixed scroll member 20 is composed of a plate 201 and a spiral 202 formed on one surface of the plate 201.
And a leg 203 provided on the plate 201 opposite to the spiral 202. The leg portion 203 is cup-shaped by a bolt 23 screwed into the leg portion 203 so as to penetrate from the outside of the bottom 121 of the cup-shaped portion 12 with its tip end surface in contact with the inner surface of the cup-shaped portion 12. It is fixed in the part 12.

Further, by disposing an O-ring 124 on the outer periphery of the plate 201 for sealing between the inner surface of the cup-shaped portion 12 and the inside thereof, the interior of the cup-shaped portion 12 is partitioned into a suction chamber 125 and a discharge chamber 126. ing. Further, a bypass hole 204 is formed in the center of the plate 201 to communicate the high-pressure sealed space formed in the center between the scroll members 21 and the discharge chamber 126.

The movable scroll member 21 is composed of a plate 211 provided on the suction chamber 125 side and a spiral body 212 formed on one surface of the plate 211. The spiral body 212 of the movable scroll member 21 is the fixed scroll member 2
The spiral body 202 is engaged with the spiral body 202 so that the center of the spiral body 212 is separated from the center of the spiral body 202 of the fixed scroll member 20 by a predetermined distance. As a result, a line contact portion is formed between the two spiral bodies, and a closed space can be formed.

On the other hand, the plate 21 of the movable scroll member 21
1 has an annular boss 213 on the surface opposite to the spiral body 212. The disk-shaped bush 12 is provided in the boss 213.
7 is rotatably fitted via a needle bearing 128. The bush 127 is provided with a balance weight 271 extending in the radial direction integrally therewith.

The movable scroll member 21 is connected to a movable scroll member driving mechanism and a rotation preventing mechanism 22, and revolves on a circular orbit of a radius by rotation of the main shaft 14. As a result, the line contact portion formed between the two spirals moves along the surface of the spiral, so that the fluid is compressed.

Therefore, the fluid that has flowed from the external fluid circuit into the suction chamber 125 in the housing 10 through the suction port 135 provided on the outer periphery of the front end plate 11 flows from the outer end portions of both spiral bodies into the fluid pocket. The taken-in and compressed fluid is sent from the fluid pockets at the center of both spiral bodies to the discharge chamber 126 through the bypass hole 204. Further, the fluid flows from the discharge chamber 126 to an external fluid circuit via a discharge port 136 provided on the housing 10.

[0018]

However, in the conventional compressor, the shaft hole 127a and the countershaft portion 141b are not provided.
There is a problem that lubricity is poor due to a small clearance between the two.

The shaft notch 14 of the sub shaft 141b
Because the snap ring 35 is located in front of 1e,
There is a problem in that lubrication is poor because it hinders oil from entering between the shaft hole 127a and the sub shaft portion 141b.

In addition, there are generated abrasion powder and degraded oil (sludge) between the metal between the shaft hole and the countershaft portion. If the amount of the sludge is large, abnormal wear of the sliding surface of another mechanism or sludge is caused. The problem of reduced durability is eliminated.

An object of the present invention is to provide a scroll type compressor which smoothly lubricates oil between a shaft hole and a countershaft portion and improves lubricity by oil.

[0022]

According to the present invention, there is provided a compressor housing having a suction chamber and a discharge chamber, a first plate disposed in the compressor housing, and a first plate disposed on the first plate. A fixed scroll member having a fixed scroll formed therein; a second plate disposed in the compressor housing;
A movable scroll member provided with a movable scroll formed on the plate body, and a main shaft disposed in the compressor housing to drive the movable scroll member, wherein the fixed scroll is rotated by rotating the movable scroll member. While changing the volume of the fluid pocket formed between the body and the movable spiral body, the fluid pocket is moved to the center, and the fluid taken in the fluid pocket from the suction chamber is compressed and discharged to the discharge chamber. In the scroll compressor, the second plate has an annular boss on a surface opposite to the movable scroll, and a disk-shaped bush is rotatably fitted in the boss. A main shaft large-diameter portion on the inner end side of the main shaft, the main shaft large-diameter portion is rotatably supported by the compressor housing by the bearing, and the main shaft large-diameter portion is provided with respect to the main shaft. Eccentric And the bush is attached to the countershaft so as to be eccentric with respect to the main shaft, and the countershaft is formed on the bush. The countershaft portion is formed with communication means communicating with a position facing the shaft hole and an end face of the bush in the axial direction. Is obtained.

Further, according to the present invention, a compressor housing having a suction chamber and a discharge chamber, a first plate disposed in the compressor housing, and a fixed plate formed on the first plate are formed. A fixed scroll member provided with a spiral body, a movable scroll member provided in the compressor housing and having a second plate body and a movable scroll body formed on the second plate body;
A main shaft disposed in the compressor housing to drive the movable scroll member; and a swivel movement of the movable scroll member to reduce a volume of a fluid pocket formed between the fixed scroll and the movable scroll. In the scroll compressor, the fluid is taken to the center while being changed, and the fluid taken in the fluid pocket from the suction chamber is compressed and discharged to the discharge chamber. An annular boss is provided on the surface opposite to the body, and a disc-shaped bush is rotatably fitted in the boss, and has a main shaft large diameter portion on the inner end side of the main shaft. The main shaft large-diameter portion is rotatably supported by the compressor housing by the bearing, and the main shaft large-diameter portion has a sub-shaft portion at an eccentric position with respect to the main shaft and from an end surface of the main shaft large-diameter portion. Stretched and in front The bush is mounted on the countershaft so as to be eccentric with respect to the main shaft, and the countershaft is inserted and connected to a shaft hole formed in the bush, and a tip of the countershaft is provided. An annular groove portion in which a snap ring is fitted is formed on the peripheral surface of the portion, and a shaft cutout portion formed in the sub shaft portion at a position facing the bottom surface of the shaft hole in the axial direction and the shaft hole, A scroll compressor having a counterbore formed on the end face of the bush, wherein the shaft cutout and the counterbore are communicated is obtained.

[0024]

According to the present invention, the notch portion is formed in the sub shaft portion 141b in the axial direction and at a position opposed to the bottom surface of the shaft hole, and the end face of the bush, that is, the sub shaft portion protrudes and the groove is formed. Since the counterbore portion is formed on the surface where the snap ring is fitted, the shaft cutout portion 141e and the counterbore portion supply oil to the shaft hole to allow a gap between the shaft hole and the sub-shaft portion. Improves lubricity with oil.

[0025]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a scroll compressor according to the present invention will be described below with reference to the drawings.
In the embodiment of the scroll compressor, since the overall configuration is the same as the configuration of the scroll compressor shown in FIG. 3, the description of the overall configuration of the same part will be omitted. In addition, the same parts as those of the related art described with reference to FIGS.

Referring to FIGS. 1 and 2, a scroll type compressor according to an embodiment comprises a movable scroll member 2.
The one plate body 211 has an annular boss 213 on the surface opposite to the spiral body 212.

In the boss 213, a disk-shaped bush 12 is provided.
7 is rotatably fitted via a needle bearing 128. A main shaft large-diameter portion 141 is provided on the inner end side of the main shaft 14. The main shaft large diameter portion 141 is rotatably supported by the bearing 13. The main spindle large diameter portion 141 is located at an eccentric position with respect to the main shaft 14 and the main spindle large diameter portion 1.
A sub shaft portion 141b extends from an end surface 141a of the shaft 41.
A disk-shaped bush 127 eccentric to the main shaft 14 is attached to the sub shaft portion 141b. Counter shaft 141b
Is inserted into and coupled to a shaft hole (located at a position eccentric with respect to the main shaft) 127a formed in the bush 127.

The sub-shaft portion 141b has a main-shaft large-diameter portion 141.
A shaft flange 141c having a larger diameter than the shaft hole 127a, which is located between the end surface 141a of the base member 141 and a rear surface facing the end surface 141a at a predetermined interval;
annular groove 141 formed on the peripheral surface of the distal end portion b
d. Snap ring 3 in groove 141d
5 are fitted.

The shaft flange portion 141c is connected to the large diameter portion 14 of the main shaft.
The bush 127 is prevented from moving to the first end surface 141a. The snap ring 35 serves to prevent the sub shaft portion 141b from moving from the bush 127 in the pull-out direction.

The countershaft portion 141b has an axial hole 12
A communication means is formed which communicates with the position facing 7a and the end face of the bush 127. The communication means is shaft hole 1
Shaft cutout portion 141e facing bush 1
27 and a counterbore portion 141f formed on the end face of the base member 27.

The shaft notch 141e is provided with a countershaft 141b.
In the axial direction and at a position facing the bottom surface of the shaft hole 127a. The counterbore portion 141f is formed on an end surface of the bush 127, that is, a surface on which the sub-shaft portion 141b protrudes and the snap ring 35 is fitted by the groove portion 141d. Shaft notch 141e and counterbore 141
f are communicated with each other. This shaft notch 141
e and the counterbore portion 141f serve to supply oil to the shaft hole 127a to improve lubricity between the shaft hole 127a and the sub shaft portion 141b.

Now, the plate body 211 of the movable scroll member 21
At the surface opposite to the spiral body 212, the annular boss 21
3 is supplied with oil. Oil is cut off 141e
The oil is supplied to the counterbore portion 141f, and the oil enters the depth of the shaft cutout portion 141e through the oil path.

[0033]

As described above, according to the scroll type compressor of the present invention, oil is supplied to the annular boss on the surface of the movable scroll member opposite to the spiral body, and the oil is supplied. Is supplied to the shaft cutout portion and the counterbore portion, and this oil penetrates into the deep portion of the shaft cutout portion, so that the oil spreads between the shaft hole and the sub shaft portion, so that lubricity is improved.

Therefore, it is possible to reduce the generation of wear powder and oil deterioration (sludge) between the metal between the shaft hole and the countershaft portion.

When there is a large amount of sludge, since the sludge is a foreign substance, the wear and durability of other sliding surfaces are reduced, but oil spreads between the shaft hole and the countershaft portion. Therefore, such a problem can be solved.

[Brief description of the drawings]

FIG. 1 is a front view showing a main part of an embodiment of a scroll compressor according to the present invention.

FIG. 2 is a sectional view taken along line II-II of FIG.

FIG. 3 is a longitudinal sectional view showing the overall configuration of the scroll compressor according to the present invention and the prior art.

FIG. 4 is a front view showing a main part of a conventional scroll compressor.

FIG. 5 is a sectional view taken along line VV of FIG. 4;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Compressor housing 11 Front end plate 12 Cup part 14 Main shaft 35 Snap ring 127 Bush 127a Shaft hole 141 Main shaft large diameter part 141b Subshaft part 141c Shaft flange 141e Shaft notch 141f Counterbore

Claims (2)

[Claims] 1. A fixed scroll comprising: a compressor housing having a suction chamber and a discharge chamber; a first plate body disposed in the compressor housing; and a fixed scroll formed on the first plate body. A movable scroll member disposed in the compressor housing, the movable scroll member including a second plate member and a movable scroll formed on the second plate member; and the movable scroll member disposed in the compressor housing. A main shaft for driving a scroll member, the orbiting movement of the movable scroll member to change the volume of a fluid pocket formed between the fixed scroll body and the movable scroll body, and move the fluid pocket to a central portion to perform the suction. In a scroll type compressor configured to compress fluid taken in the fluid pocket from a chamber and discharge the fluid into the discharge chamber, the second plate has an annular boss on a surface opposite to the movable scroll. A disc-shaped bush is rotatably fitted in the boss, and has a large-diameter portion of the main shaft at the inner end side of the main shaft. The large-diameter portion of the main shaft is rotatably supported by the bearing. The main shaft large-diameter portion is supported by a compressor housing, and a sub shaft portion extends from the end surface of the main shaft large-diameter portion at a position eccentric to the main shaft, and the bush is eccentric with respect to the main shaft. So that the sub-shaft is inserted into and connected to a shaft hole formed in the bush, and is attached to the sub-shaft in the axial direction and in the shaft hole. A scroll-type compressor, wherein a communication means communicating with an opposing position and an end face of the bush is formed. 2. A fixed scroll comprising: a compressor housing having a suction chamber and a discharge chamber; a first plate disposed in the compressor housing; and a fixed scroll formed on the first plate. A movable scroll member disposed in the compressor housing, the movable scroll member including a second plate member and a movable scroll formed on the second plate member; and the movable scroll member disposed in the compressor housing. A main shaft for driving a scroll member, the orbiting movement of the movable scroll member to change the volume of a fluid pocket formed between the fixed scroll body and the movable scroll body, and move the fluid pocket to a central portion to perform the suction. In a scroll type compressor configured to compress fluid taken in the fluid pocket from a chamber and discharge the fluid into the discharge chamber, the second plate has an annular boss on a surface opposite to the movable scroll. A disc-shaped bush is rotatably fitted in the boss, and has a large-diameter portion of the main shaft at the inner end side of the main shaft. The large-diameter portion of the main shaft is rotatably supported by the bearing. The main shaft large-diameter portion is supported by a compressor housing, and a sub shaft portion extends from the end surface of the main shaft large-diameter portion at a position eccentric to the main shaft, and the bush is eccentric with respect to the main shaft. The countershaft is inserted into and connected to a shaft hole formed in the bush, and a snap ring is formed on a peripheral surface of a tip end of the countershaft. Are formed in the counter shaft portion, and a shaft cutout portion is formed in the sub shaft portion at a position facing the bottom surface of the shaft hole in the axial direction, and a counterbore formed on an end surface of the bush. Part, and the shaft notch part and the counterbore part are connected to each other. A scroll type compressor characterized by passing through.